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Authors
Hyvönen, Hanna
Korhonen, Linda
Hannonen, Juuli
Serlo, Willy
Sinikumpu, Juha-Jaakko
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Article History
Received: 20 April 2018
Accepted: 23 May 2019
First Online: 19 June 2019
Ethics approval and consent to participate
: In this study no one patient was contacted for the study purpose, i.e. this is a registry-based research and no Ethical Board approval was required. However, institutional approval to use the registry data was achieved prior to study initiation (Study number 213/2012, Oulu University Hospital).
: Not applicable.
: The authors declare that they have no competing interests.
